Pulley



Sept. 4, 1923.

H. N. ATWOOD PULLEY Filed April 25. 1922 /Il/lI///I /l/l/l//l//l//l/l//l/l/l I///////////////////////////// Il////////////////////////// I///// l// l///////////////////// /////////////////////////////VY l/ I/ I// I//////////////////// ////lr// I r//////////////////// l/l/ 1/ I /l/l I l////l////l HARRY N. ATWOOD, OF SMITHFIELD, NORTH CAROLINA, ASSIGNOR TO RUBWOD,

ING., OI LAWRENCE, MASSACHUSETTS,

A CORPORATION OF MASSACHUSETTS.

PULLEY.

' i Application filed April 25,

To all whom it may concem.:

Be it known that I, HARRY N. A'rwoo), a)

i citizen of the United States, residing at Smithfield, in the county of Johnston and State of North Carolina, have invented certain new and useful Improvements in Pulleys, of which the following is a specification.

This invention relatesto improvements in pulleys and has as one of its objects to provide a pulley so constructed as to insure against slipping of the belt trained thereabout and therefore provide for the more effective and steady transmission of power to the belt orto the pulley, as the case may be.

In order to provide against slippage of pulley belts it has been proposed to provide pulleys with facin s of friction material but this has generally n found to be unsatisfactory for varous reasons, chief among which is the liability of the facing to be torn loose. The present invention therefore has as another important object to provide a pulley having a face of a character to afford the desired frictional contact with the belt and yet not Iiable to disintegration as in the case of pulleys having sheets or coverings of friction material.

Another object of the invention is to provide a pulley which will be exceptionally substantal and durable and not liableto become warped, or otherwise distorted.

In the accompanying drawings:

F igure 1 is a diametric sectional view through a pulley constructed in accordance with the present invention;

F igure 2 is a fragmentary sectional View illustrating a slight modification of the invention. V

A pulley constructed .in accordance with the present invention is made up of a plurality of plies of fibrous material alternately arranged with plies of friction material, and in one specific'embodiment of the invention the first mentioned lies which are indicated by the numeral 1 wi he made of veneer, and the other plies which are indicated by the numeral 2 will be made of rubber. In building up the structure the plies are alternately disposed 'face to face wth the veneer plies p-ofe-ably so arranged that the grain in adjcent ples will run non-parallel, and the assemblage is then sub'ected to a process of vulcanization by whi the plies are inti- .1922. Serial m; 556,37o.

mately bonded into a composite whole. The plies may be variously proportioned as regards their thickness, but they are preferably of substantially uniform diameter so tha-t the 'peripheries of adjacent plies will be in registration. Therefore in the completed pulley, the circumferential face will comprise the peripheries of the veneer and rubber plies.

It is preferable that veneer be employed in .producing the plies l, although other fibrous material may be found adaptable for the purpose, and it is likewise preferable that rubber be employed in producing the plies 2 as it will serve not `only as a frictional material but also as a bonding material. In any event the plies 2, having their peripheries presented at the circumferential face of the pulley, will insure of a maximum degree of frictional contact of the belt with the pulley and, if wear occurs, the effectiveness of the pulley will not be diminished but will maintain throughout the life of the pulley as a whole.

The veneer plies 1 serve of course to impart to the vpulley the desired degree of rigidity, and because of the nature of the material of which they are formed, they will not be liable to rapidly wear but will be exceptionally durable and will therefore ,to a great extent minimize the wear upon the plies 2 which are of a softer material. Furthermore because of the interposition of the friction plies 2 between the relatively durable plies 1, there is little or no likeli- 'hood of the peripheral portions of the plies 2 ll)eing to`rn away through contact with the be t. v

From the foregoin it will be understood that pulleys of practcally any type or design may be constructed in accordance with the principles of the invention and that pulleys so constructed areadapted for useful application. Thereforc -it will be understood that the drawings are to be taken merely as illustrative of the application of the principles of the invention and it will be' evident that pulleys of the solid, split, and other types may be made in accordance therewith in any and all shapes, designs, and szes.

In the modified form of the invention shown in Figura 2 of the drawing sheets 'of I wre nesh indicated by the numeral 3, are

embedded in the rubber plie's 2% asto reginallg in registration with the veneer plies. inforce the structure. I 2; pulley comprising a plural'ty of plies Having thus descr'bed the inventon what o'eeerand a plurality of bonding plies is claimed as new is: of rubber alternately arranged and facially 5 1. A pulley comprising a plurality of ples united, the latter ples having' their perphof veneer and a plurality of bonding plies eries presented at 'the crcumferental face of elastie fricton material alternatelyarof the pulley. ranged and facially united, the latter plies In testimony whereof I aflix my signature. havng their peripheres presented at the 10 circumferential face of the pulley and mar- HARRY'N. ATWOOD. [u 5.] 

